1. RBSA Residential Building Stock Assessment Analysis of public power sample in BPA territory using single-family and manufactured homes databases
July 25, 2013

2. RBSA brought to you by: Introduction and Overview Ecova Delta-T
About the RBSA
Assessment of residential buildings which audited the major energy- related components of homes from a representative sample of more than 1,850 single-family, manufactured, and multifamily homes in the Pacific Northwest.
RBSA brought to you by:
Ecova
Delta-T

3. Introduction and Overview
Research Objective of This Study
This analysis of single-family and manufactured home RBSA data characterizes BPA’s territory and identifies program opportunities for future energy efficiency activities.

4. Methodology Sampling Data Collection Unit of Analysis
A representative sample of single-family and manufactured homes in the PNW (1,404 single-family homes and 321 manufactured homes).
Sample size large enough to achieve 90%+/-10% confidence and precision within:
Entire PNW, BPA region, and each of the BPA’s five sub-regions
MH sample not large enough within BPA’s sub-regions
All analyses are weighted to describe the population.
Data Collection
Two-hour on-site visits by two auditors between late 2011 and mid 2012.
Unit of Analysis
The unit of analysis for this study is an occupied housing unit or a house.
For analyses that involves multiple instances of a particular component, we used a selected component as a unit or weighted proportion.

5. Analysis by building type
Methodology
Analysis by building type
Analysis aggregated
Building Characteristics YES
Envelope YES
HVAC YES
Lighting YES
Water Heating YES
Appliance YES
Consumer electronics YES
Utility Domains for Analyses
BPA status: Utilities in BPA service territory vs. non-BPA territory
BPA sub-region: BPA utilities in Puget Sound, Western Washington, Western Oregon, Eastern Oregon and Washington, and Idaho and Montana
SRR status: BPA utilities serving SRR (rural), non-SRR Option 1 (suburban), and Option 2 (urban)
Rate design: BPA utilities with slice block power purchase vs. load following agreement

6. Final Sample Distribution – Entire Pacific Northwest
Note: Colored areas represent utility boundaries. Locations of sampled homes are approximated by zip code.

7. Final Sample Distribution – Within BPA Regions
Note: Colored areas represent utility boundaries. Locations of sampled homes are approximated by zip code.

8. SF – Building Characteristics~
100%
SF – Building Characteristics

9. SF – Building Characteristics

10. SF – Building Characteristics

11. SF – Building Characteristics

12. SF – Foundation

13. SF – Building Characteristics

14. SF – Building Characteristics

15. MH – Building Characteristics

16. MH – Building Characteristics* * * *
Note: Bars with asterisk (*) indicate small sample (< 68).

17. SF – Envelope

18. SF – Attic Insulation

19. SF – Envelope * *
Note: Bars with asterisk (*) indicate small sample (< 68). This analysis is only among the sites without crawl space wall insulation.

20. MH – Envelope

21. SF – Envelope

22. MH – Envelope

23. * * * * * * * * SF – Envelope Average in BPA region
Typical weatherization program goal
Energy Star New Home’s requirement * * * * * * * *
Note: Bars with asterisk (*) indicate small sample (< 30).

24. * * * * * * * * * * MH – Envelope Average in BPA region
Typical weatherization program goal
Energy Star New Home’s requirement * * * * * * * * * *
Note: Bars with asterisk (*) indicate small sample (< 30).

25. SF – HVAC
Note: “Electric Zonal” includes baseboard, boiler, and plug-in heater. “Heat Pump” includes DHP. “Gas – Other systems includes boiler and stove heater. “Other fuel types” includes oil-, propane-, pellets-, or wood-based systems.

26. SF – Wood Consumption
Note: Wood use is self-report data. The analysis is among homes that use electricity as primary heating fuel or wood as primary and electric as secondary.

27. SF – Resistance Heat

28. MH – HVAC

29. MH – HVAC

30. SF – Cooling System
Note: “Window unit” includes PTAC and windowshaker.

31. MH – HVAC

32. SF & MH – Lighting

33. SF & MH – Lighting

34. SF & MH – Exterior Lighting

35. SF & MH – Interior LPD
LPD (Lighting Power Density) – ratio of light output in an area and the electric power used to produce that light.

36. SF & MH – Showerhead

37. SF & MH – Water Technology
Other
SF & MH – Water Technology
Gas storage
Electric storage

38. SF & MH – Appliances

39. Program Opportunities – summary of all measures
Envelope measures
Attic and floor insulation measures in older vintage homes and in urban regions.
Air-tightening measures for older vintage homes.
HVAC measures
Central heat pump and DHP conversion opportunities in E. Oregon and Washington, W. Oregon and Washington and Puget Sound.
DHP conversion opportunities among manufactured homes.
Lighting
26% of region’s lamps are EISA exempt, a majority of which are incandescent or halogen lamps.

40. Primary Program Opportunities
Water technologies
Low-flow showerheads opportunities in W. Oregon and W. Washington.
Appliances
Earlier retirement of aged refrigerators with priorities in rural and suburban regions.

41. Thank you! Contacts Jun Suzuki (Project Manager) Carrie Cobb
Carrie Cobb